Myth 1: Brushing after every meal is necessary. While it's important to brush twice daily, brushing excessively can damage tooth enamel. Myth 2: Dental X-rays are only needed if you have a problem. Dental X-rays can detect cavities and other issues before they cause pain. Myth 3: Whitening toothpaste can whiten as well as strips or trays. Only professional treatments or custom trays can significantly whiten teeth.